From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09393C4332F for ; Mon, 19 Dec 2022 10:59:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231571AbiLSK7t (ORCPT ); Mon, 19 Dec 2022 05:59:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56876 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231197AbiLSK7o (ORCPT ); Mon, 19 Dec 2022 05:59:44 -0500 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 14C75BB; Mon, 19 Dec 2022 02:59:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=iwo/jJFl/Dhn1CRlJw0Sj+lFmQiUDcd14xHBrPkn8OQ=; b=LNQnpk7bSgySSRdqxKBA17IL1Z j1QYdfSCgQerCEdQIcsmbMu4TV5/8Pg/BLHOvCzgeD7BOq6VvMNBSEBd8DVpYFoRC/JNnqpMRW71I WI2otZOTLfxYGWOCPVrraT6QUnSpGBkaiSmGYWr+AXBwrJxbDWAGao6U/eRb/EnvkxRHwjiHWDyyk ZTvazOkVA3oyM9KpTxjvtJ2zA35Zs5VlZRsFVHD7or+wuVAIY4G/ZH/iX+D9vyHAqqt9ydO+Fm6Ys 8Hs0eNf3TqChdiADU+ql3ZD0m2vHAX/TXsXIdvZSELhDTURgGCFwQJwez75XSp/Ks/lJjoLCXbiaF rnBu8Dxg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1p7DrK-00CYLT-3A; Mon, 19 Dec 2022 10:59:05 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 498E1300348; Mon, 19 Dec 2022 11:59:01 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 27714202FE504; Mon, 19 Dec 2022 11:59:01 +0100 (CET) Date: Mon, 19 Dec 2022 11:59:01 +0100 From: Peter Zijlstra To: Greg KH Cc: "Guilherme G. Piccoli" , stable@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, corbet@lwn.net, kernel-dev@igalia.com, kernel@gpiccoli.net, fenghua.yu@intel.com, joshua@froggi.es, pgofman@codeweavers.com, pavel@denx.de, pgriffais@valvesoftware.com, zfigura@codeweavers.com, cristian.ciocaltea@collabora.com, Thomas Gleixner , Dave Hansen , Tony Luck , Andre Almeida Subject: Re: [PATCH 6.0.y / 6.1.y] x86/split_lock: Add sysctl to control the misery mode Message-ID: References: <20221218234400.795055-1-gpiccoli@igalia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 19, 2022 at 11:17:39AM +0100, Greg KH wrote: > What specific programs have this problem and what are the exact results > of it? IIRC it was God of War (2018) that triggered this initially. But it's possible more games were found to tickle this specific thing. Since it's binary only gunk that is unlikely to ever get fixed we need something to allow for it. (slow motion Kratos yelling B...o...y...) > Also, this is really a new feature and not really a "fix", but one could > argue a lot that this is a "resolve a performance problem" if you want > to and have the numbers to back it up {hint} Right, there were some, they should indeed have been included.